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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21104da6defbc418d70de214acbde27f7c8060b64b9d9b0e0e9a661613cc680b' 
  AND token = 'eqtZTooJiWTE3ceEC7OLVPwj+kpDjDA25HPPYGVLfC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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