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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19731df8e23c4fac2cf03c694a5cf29a54da5cd8f8541a487615aa9d3f6a17f' 
  AND token = 'LTvZ5dXrlkY9fhY2AOmnmftItcV3H2kamSJU+mV4ZcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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