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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8038090c837580ed5f4e78681b7da386ff1da4902b95b47b1bd0e5b21ec1fa15' 
  AND token = 'iX+JA5ddx9bHLxCPa0JpuY+hd7vz82Xbo23WBg4Ed4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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