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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3fff0993b61dae52e0280ca257f1202fee1aae810721fc54d5380085ded5bf' 
  AND token = '2JMZD+t2W+anB+meLCVnIRfh+diLzjp5Gx/dy2hdCeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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