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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d6b7baa54f7a1298b458f40060d7de90e405c7acd3d4da060331f515ac9a0e' 
  AND token = 'Bsc5NMZdyw6nIRcWKfwk9+nK5gozs62LT9oA4t2Uu/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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