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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b14e534f3c7a89c6e6e0351b34be5ecaf586dded89548bd4534e5b0175e127' 
  AND token = 'vJWCxDlc1KZT/BtXmBKy6qGHEnWZ7mMtes6nfK/egng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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