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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39dca5dbabb11a20b3eefea543be997da39d940cc01ee762ea3abba1d0f396f4' 
  AND token = 'Ea+t864opi36gfCq/M0bX/5P7qvA8DBRoHMDaXFoR7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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