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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34de05294da214c307f7f05125500236bdabb873eea1525ad5f18bd7a04618a3' 
  AND token = 'febAhM/FLPkOPhG3apWGAo+XB8Ylo31Pu2A8wvELKf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}