SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1369ff012995f0c84e86626299d88a8660e9103cd32dc26844ea77b0417147c' 
  AND token = 'HxTfXnhKzUUJdbYItdeM6hC1zyFQxOcwtLkptuZNX2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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