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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8323e3c1eed540a191ec62a21ee3a60651636804b9d3ae7d289a768f0ea020' 
  AND token = 'YvN71B45pF+U2edXJt4tig6dUhuAW3Ll550L0G5yYX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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