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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72a288c60064b8fc1f2fe4c86874e7f6705c108e5ec569c4d8e40c8b4773d7c' 
  AND token = 'AEZZ3lgN/nOvOTR7dkzf0NbKCgVH5v0xB0sBrTDOEbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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