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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79b36b426a26e63139cdba8faa1c93e747b9f232044fefdb8614fb76f2908ac' 
  AND token = 'NAafDcDSE/c1MGroKpLQaa7LM6QJrmYQRSHXLeOFM6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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