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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8925bca06fd07e2a50a6231b0a678b4681179a750c8573447bc01507308525' 
  AND token = 'eiLZSSrm2nrjZtDgFLvBuVey5lgg7h2SQ9S6VA0P+/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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