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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cf2dd14c1a873fd8048a32f192d0d6d9d7124694023ccb200dcb283cb57319' 
  AND token = 'OvaUp7IfPZKhzkbqEPtyHMXhK+OBI+DGok7wOryDo0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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