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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353ba8ce0c85d8e305c60227d35603fefe929d607232416ec430e203047b2508' 
  AND token = 'JAN8i7s6dMojppOOZ6y9wj8HXJrr+r/nBa8npR9Acd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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