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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a08c33802fd9df277d466dc551c5bbb347a0d5204eb83abc435dfc3537c5ec5' 
  AND token = 'yGTg5iapSmImine8XvAF+1qm9yNZf2ju5NCHSfclqOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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