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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13c297f985cb5b97a7fcbf786585958d3540995f3e063a5b2c4d4e6ce6bc4fb' 
  AND token = 'tTQx8c1QlzR2KcKbCpYSLEA98cVi7QyYDoVYPG2Y71k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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