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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06104e50ac0eaaa1186070b6e2c766abc3f494b7a15e81398f96a6c90b1fd54' 
  AND token = 'hZSO2hnyyGGDcmCwLTuWJHJOVdSJlaOKdnT0SUCF4N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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