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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37df7530935fec2b0622b1c5445f7b30467be991209fb3904c75f7426fc6e16' 
  AND token = 'Mg0n+K2uVWBtg0daaPSbEncVxoCH0ZHGU2AAen1Ni5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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