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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6020eec12d17cd970bff653272d07790affcb5c7a02f162c2d014a7f0a56da20' 
  AND token = 'wf26Xlttp3iBaJA2qR5pub5WLsAZE8xAPSCv0/CQ6Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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