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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea0a9eeff0d10ccf4aa907a44ec19275cfd5aa4e77e1d2509f207aa67aa94f8' 
  AND token = 'l2UOv5lut2y0D7b0pDEfY+ve9cPreJqqpWD53/DDTu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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