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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09511686e0a6574fe8717473e1cfd4e5b689b7ba1014c61429887f2edcf4a399' 
  AND token = 'Mx+HySLnJ+6ma/p5jQlQ7pqDTTXKt2rwnfRqLLhMi60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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