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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0313565b00447ca8ce7d3ad519ac9af9e9bf001bed9ee39d8aacb9ba6f130ac' 
  AND token = 'EUzhHYtiRB8HVdljpvYtgLK7gEpH/wwr5oWdyI1Whss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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