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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ef40160d069b6ed65388ae5835976bded894d03932ec37f7c20b9b7c2b4041' 
  AND token = 'f9LrruxTJGnNm+BlkB6aic1N3FRP7u/JFCzzconjTrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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