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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca5e60c0ada844298d2cf42746da9591fa1d66e5f20c93c77a984949cb1476f' 
  AND token = 'o/Gbfmr/9lp5wZuQ1Zz5KGa/xI77yZuWdUwS/ZIgem0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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