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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d512684e394c5e6bc903707204960d79b31719beb0b800925f7738ec9fffb4' 
  AND token = 'M1gd2yBFYbguF1poMOSlJNGzfRqGpZtRRNio9zgONPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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