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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371b24fb4cb45b1608a3acd91062b756d02680222d3468fb19f4b9fa287a982f' 
  AND token = 'cr92Pi2so2P0v9xh3nxdTgNVLz3ln12rVhFvh18K1PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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