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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21db92055b58e0b7d57fec407e6b5bb7cc5860637d0d1e3c76a0baa72f3bb91' 
  AND token = 'uvwz3Hht6Z8CtcZbaU9P/YHS2z6uaad//iJ4iEVAmYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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