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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74e07f2b2420cb95440685bb8cd91f5119a049df7e8e61915fad695743c266e' 
  AND token = 'oDSBlZQISAtzLiBY1Vk51Cqz6xhQE8jaE5XTiOf0AC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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