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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df27c4f863fea8a6c4251ec281f973bc80552afc46c06eb40116064593d279c3' 
  AND token = 'SZnJlnFxN25F2mGxx3g+71UNksDQ074xuG2cXU91ozA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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