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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea792530a11f6fe808eaab2a92ba1515fdfdd474eb4c6f7b8c3891b42916228' 
  AND token = 'ENmFVKkq4qyNUnnbsJZhjwL08Y8e9oYuL1SII9sg03U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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