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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b158cd9f20ef18bb70d42204a981cc8c6cc7db9d32a123deaf83cb9a4354cbc' 
  AND token = 'LWCXW4anmNFSeoaVrX70Qt6z0oMpSqf6EFrvH+gBFlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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