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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1bb72070c21d61ddd6fb398aa53d15e5a11c9fc5927b9da2abc309aa970909' 
  AND token = 'N2phaX68/v1WZgj/LFGjf8cZKqnswdqQk8QEZmo0ET0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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