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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cab777c8c09775deefd5a0201a382b58ff92fb9267f84eb246f6c45b22c835b' 
  AND token = 'f8qm9UJ29GN1kV41p7xS16kdEHAh2+0YSUhCQG9FtEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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