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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08af44e4a5fa1947d60e2985c90a0f9751d85b613db69b0a4b4303abb0ed3e5f' 
  AND token = 'JE0Ev1rXAddkcy/M7DJgZ+kJso4ZOttEZHtStZJjMl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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