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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc010bd7429a3f7a3f9ae39bb793a4f04d2b8e2c1d8fdac3028e85a90a36aed' 
  AND token = 'mAMm8WIIWmjXdEwySY63wSLM31Xl3Rjl2eVbLBmNwqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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