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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11d782724aa65c868efec1094bc0dd9009bf4799c6fe6011088ae69cd35e71b' 
  AND token = 'CObJ23Ea9Dq+P5bKJBd7ZkI1QoMK1Yy/SDtCWT5Z8Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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