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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4644d2556fb2bda5a2ceb57bb91e6c6c2b0c9c8ac4de7c8f14d6855cc57837c3' 
  AND token = 'SWlb08OF8IDWoKv1G0VHUWZ3B5wZwjq4voo8jgbbn9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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