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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca1ac34eed379347a233cf5e41940773fbda6c3077c0cc0791e119c790191b0' 
  AND token = 'dPL+DYcAw/4GdbXEAs6l9gpy3cswesv235JuOCTh65c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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