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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b6211ad5a633acc6526e181748671c003ec133b5f6814b6eab106bafadfa1f' 
  AND token = 'lkNAnqKxPIJF0KzG37hL+gciEkit28rHv86iaodm+1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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