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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f54cad467fe1e9b0365e9ad3bb7cc5f9c88099a037b23de9f0c7d2b4ffcf19b' 
  AND token = 'y5EsKo390m56EsOLpRXv/kW77YklBTTFPNePuNDd6u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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