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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714f2daf94dc7cb22cd3d91ae5c8597e8d1650e9aedd4f9908c65674c55d45d9' 
  AND token = 'yDUfvdDr5eP00gi+FZUO7X/kaoawNnZhmubxvskqenk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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