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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9b8bde8f288e9824da448e68188f3958acde6b1a08ef78f187de01054096b5' 
  AND token = 'vcWBHNcBe/0NiN4hf8nPQ5SNVktS5BbAiO1JQayU6Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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