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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe62348333f0b6f23d0c6423a20ef6f567bfab5755ce28f964cc9aeb9fbffefc' 
  AND token = 'HoSq0X7O2Pni8v9AgDR3ldZp+XMLm9kcOuL+1XZ/0uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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