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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4275f12d2d44156dab26efb03f975f87ac8e25ed753da94b251ca57548428fd8' 
  AND token = 'D80Z8ifKG3tsKPsa25HKocmNeRb3iX2qTUPU4ziXXUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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