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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db751e02bad44cd96313d4916b3c7e68dd47650c9b1dfd16b24408ec2c06bfeb' 
  AND token = 'VB2W62cDWD8tVS28uyScFKJM69g9cCcf6yUT2PQl4dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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