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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0970531e664f18ed7533ef21345fff7528d0e31ff3f7ec075bedec24d57b6f80' 
  AND token = 'RvIyym6uaUTNJG9pSNrO9KVxyXv3vkBePrE/3P8ST7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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