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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '225acee4778f1915ab5a70b5c189e617691d8dc52aa6f266b343c33369ed8636' 
  AND token = 'fxnnw/xgzEfkcqzAXvWDE7vM3Cv/UWzK8RtOc9yQf/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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