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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0967fe8f19bb4cf18eb1fe00ccc9672793cb466f1bc174aa997d5aae011b2b' 
  AND token = 'K4OHXNr2pIq7QwSl4Tl9NM87CV0qambQJcKOiRu0Rjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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