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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c8c8d7cf7c20c4fa9ea3f6dc244feb19b3a7467e2c5d1d34fd7a5a5e3d09ba' 
  AND token = 'WAPhULI5okF2jKzpIuzCp3TJFgy4K88WULsSAfeCgCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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