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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0284582b28b54c385c9424fb316bc9b1818a61951036e5bd8da92a4e63191c7' 
  AND token = 'lpcxYcnWEZHw61cE0LVOTM4SYuKpsrBoP9PLetIePjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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