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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a642a244d64fb4eb87aca27b85061241cb651aed7309a1dcbb97d0b56623ee5' 
  AND token = 'nZDs1bCdPSmjokrttFLTfq32TlNGWYHiVjpdM1yljj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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