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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84843392731e5fd30c0a4c4dda3471bbfd634a48906e986f09529c67b0188fe' 
  AND token = 'fMNBg+GTy0rEaM6Wd+DWtPrv5yx0TtQXl730Aq6yWwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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