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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf4faa4acca107a63a4228c335ff7ae3a82e37f0360398ec704b3f9df3f5895' 
  AND token = 'cuCoUY/Sk1HRIT0yDPXzecvXIQw8/o8bSNoPI8Zmr2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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