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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06377176d16e3c2435fcb380c9da475adaadd29ad15915b6a5b5c912c7b9415c' 
  AND token = 'wkwifpjjtIc7wuzgl4fIz6937EFuFdo4FS4ntg9Lp1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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