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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e2e035169e114937488b0ad9e214e59799936f451a48df92f4c9e0e0c58fcb' 
  AND token = 'klpBV2oQ6SQxXRCFo1P80kURzfQjgkf5jZUp/az3DM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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