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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8b69f77e1d161caad1324c9bcd76ab65c9ec3fc62ed568807458b977737492' 
  AND token = 'hNVsq69kTFzoga+CPw0k0e6LHp+wDCAQ5I9SUrkmclo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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