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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c8512e479db9a1be76e22d5f01faf3996b588872fc7e49e1d7bf0fbc9a8462' 
  AND token = 'SLXCOiB+ouFbdnH085B1G/wSFmlXR43yD3eQXswlRuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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