SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513cd18812b6c743d13db491b251026059af2d1f527333d2ae2bfb2c86b89c04' 
  AND token = 'HBwCIi6ZA2ZpfAnsd4XmbvjQoqhYrIKsKmXBG8hcpgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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