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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb341db9c0fa8ed0735b64fc45f0015681347d3f3c0f2a03ca93895cceb741bd' 
  AND token = 'x3sFLyt2QL9Z0FpTXOlW87XHSc707+4rC5i37fbICpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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